Abstract

The olive grove traditional production maintenance is linked to biodiversity and the knowledge of plant landscape and vegetation dynamics is at the bottom of this process. In this context the hierarchical analysis of the landscape of the olive grove area of North Western Sardinia and the geobotanical analysis of vegetation, according to the phytosociological method, were carried out. Two landscape units with the same geopedologic, bioclimatic and vegetational characteristics were identified: the low mesomediterranean unit of the calcareous-marley substrata and the dry thermomediterranean unit of the alluvial plains. Inside these units five main vegetation series were recognized and described: Asparago acutifolii-Oleo sylvestris, Prasio majoris-Querco ilicis, Pyro amygdaliformis- Querco ilicis, Lonicero implexae-Querco virgilianae and Allio triquetri-Ulmo minoris sigmeta. These dynamic models represent an effective management tool. Furthermore a high conservation value of these systems was detected: accordig to the “Habitats” Directive (92/43/EEC) five habitats of community interest were identified in the studied area: 5220, 5330, 92A0, 9320, 9340. These results, which have pointed out the high conservation value of the olive groves of the studied area, should be taken into account in the management projects as well as socio-economical data.

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